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INSERTION LOSS (IL), RETURN LOSS (RL), NEAR END CROSSTALK NOISE REJECTION (NEXT), DIFFERENTIAL-MODE TO COMMON-MODE, AND COMMON MODE TO COMMON MODE NOISE REJECTION TEST PROCEDURE FOR LAN MAGNETICS
网络连接器的插入损耗、反射损耗、近端串扰噪声抑制、共模与差模的转换、共模噪声抑制的测试程序
1. Introduction
简介
1.1 Scope
This procedure applies to LAN Magnetics, such as discrete, RJ45 electrical connectors.
1.1 适用范围
这个测试程序适用于网络连接器 。例如：变压器，共模扼流圈，RJ45电子连接器。
1.2 Object
This standard describes test methods to measure IL, RL, Near-End Crosstalk, DM TO CM and CM TO CM in the frequency domains. It is designed to serve the public interest through eliminating misunderstandings between designers, producers and inspectors, facilitating interchangeability and improvement of products.
1.2s parameter 目的
这个文件讲叙了在频域内插入损耗、反射损耗、近端串扰、共模与差模的转换及共模抑制的测试方法，以便设计者、生产者和检验者更好的相互了解，从而达到更快更好的改善和改良产品的目的。
1.3 Definitions
定义
1.3.1 Stimulus signal激励源（信号源）
With the frequency domain method, the stimulus signal is sinusoidal.
用频域分析法，激励源是正弦曲线。
1.3.2Common Mode Impedance (Z)
The impedance measured between the input and the output of a network. This is measured with all the inputs shorted and all the outputs shorted. This CM impedance reduces the noise energy that causes EMI. The resulting impedance in the signal path should not modify the signal.
1.3.2 共模阻抗
共模阻抗是指一个网络输入与输出之间的阻抗，测试时需将所有的输入输出分别短路。共模阻抗能够减弱引起电磁干扰的噪声。在信号传输路径上产生的阻抗不应该影响这个信号。
1.3.3 Common Mode Signal
The signal that is in phase on both signal lines. This results in EMI. EMI can either be radiated or conducted (into the power line). Common mode signals in digital terminal equipment are created by imbalances in the signal transmission or in the conversion of differential mode signals by impedance mismatches.
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